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/*
* This file has been modified for the cdrkit suite.
*
* The behaviour and appearence of the program code below can differ to a major
* extent from the version distributed by the original author(s).
*
* For details, see Changelog file distributed with the cdrkit package. If you
* received this file from another source then ask the distributing person for
* a log of modifications.
*
*/
/* @(#)filereopen.c 1.15 04/08/08 Copyright 1986, 1995 J. Schilling */
/*
* open new file on old stream
*
* Copyright (c) 1986, 1995 J. Schilling
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; see the file COPYING. If not, write to the Free Software
* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "schilyio.h"
/*
* Note that because of a definition in schilyio.h we are using fseeko()/ftello()
* instead of fseek()/ftell() if available.
*/
LOCAL char *fmtab[] = {
"", /* 0 FI_NONE */
"r", /* 1 FI_READ */
"r+", /* 2 FI_WRITE **1) */
"r+", /* 3 FI_READ | FI_WRITE */
"b", /* 4 FI_NONE | FI_BINARY */
"rb", /* 5 FI_READ | FI_BINARY */
"r+b", /* 6 FI_WRITE | FI_BINARY **1) */
"r+b", /* 7 FI_READ | FI_WRITE | FI_BINARY */
/* + FI_APPEND */ "", /* 0 FI_NONE */
/* ... */ "r", /* 1 FI_READ */
"a", /* 2 FI_WRITE **1) */
"a+", /* 3 FI_READ | FI_WRITE */
"b", /* 4 FI_NONE | FI_BINARY */
"rb", /* 5 FI_READ | FI_BINARY */
"ab", /* 6 FI_WRITE | FI_BINARY **1) */
"a+b", /* 7 FI_READ | FI_WRITE | FI_BINARY */
};
/*
* NOTES:
* 1) there is no fopen() mode that opens for writing
* without creating/truncating at the same time.
*
* "w" will create/trunc files with fopen()
* "a" will create files with fopen()
*/
EXPORT FILE *
filereopen(name, mode, fp)
const char *name;
const char *mode;
FILE *fp;
{
int ret;
int omode = 0;
int flag = 0;
if (!_cvmod(mode, &omode, &flag))
return ((FILE *) NULL);
/*
* create/truncate file if necessary
*/
if ((ret = _openfd(name, omode)) < 0)
return ((FILE *) NULL);
close(ret);
fp = freopen(name,
fmtab[flag & (FI_READ | FI_WRITE | FI_BINARY | FI_APPEND)], fp);
if (fp != (FILE *) NULL) {
set_my_flag(fp, 0); /* must clear it if fp is reused */
if (flag & FI_APPEND) {
(void) fseek(fp, (off_t)0, SEEK_END);
}
if (flag & FI_UNBUF) {
setbuf(fp, NULL);
add_my_flag(fp, _IOUNBUF);
}
}
return (fp);
}
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